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Amazon offers the STP 5.25-oz. Super Concentrated Fuel Injector Cleaner, model no. 78575, for $2.97. (Walmart charges the same.) Check out via Subscribe & Save to drop it to $2.52 and bag free shipping. That's about $3 under the price you'd expect to pay at your local store. It contains concentrated detergents that help dissolve and remove harmful carbon, gum and varnish deposits on fuel injectors.
Be sure to cancel your subscription once your order arrives to avoid being billed for subsequent shipments.
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